c) AV bundle
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The interventricular septum is the tissue that is found in the center of the heart between the right and left ventricles. The AV bundles are the fibers that are located here at the superior region that connects the impulse from the AV node (in the right atrium) to the subendocardial conducting network (Purkinje Fibers). The SA node is where the entire electrical signal originates in the right atrium.